Banana Cake Or Banana Bread

Name: Banana Cake Or Banana Bread
Ingredients: 1½ cups (210 g) flour; 1 teaspoon baking powder (I always use Rumford); ½ teaspoon baking soda; ½ teaspoon salt; 1 teaspoon ground cinnamon; ¾ cup (150 g) sugar; 2 tablespoons (55 g) melted butter (salted or unsalted); 1 large egg white; 1 large egg, at room temperature; 1 cup (250 ml) banana puree, made from about 2 very ripe medium-sized bananas; ½ cup (125 ml) sour cream, regular or low-fat (I used fromage blanc); 1/3 cup (60 g) chocolate chips or 3 tablespoons (30 g) cocoa nibs